Method for controlling subsidence of operating subway tunnel

Abstract

The invention discloses a method for controlling subsidence of an operating subway tunnel. The method comprises the following steps of: excavating vertical working wells at two sides of the operating subway tunnel to the bottom elevation of the tunnel; then, performing bored cast-in-place pile or prestressed pipe pile construction in the working wells at both sides; subsequently, building a transverse reinforced concrete head piece at the bottom elevation of the tunnel, wherein the head piece and bored cast-in-place piles or prestressed pipe piles at both sides form portal support structures of the operating subway tunnel together; and finally, backfilling the working wells. By arranging the portal support structures in weak soil layer section areas along the longitudinal direction of the operating subway tunnel at intervals of 100m-500m, the problem that the weak soil layer subsidence is caused to the operating subway tunnel due to train load is integrally controlled. The method for controlling the subsidence of the operating subway tunnel has the advantages that the normal traffic in the tunnel is not influenced during the construction period; the excavated volume is small; the protect amount is small; the construction cost is low; influences on surrounding buildings, the operating subway tunnel and the environment are small; and the problem that the long-term subsidence caused to the weak soil layer section area due to the train load can be solved at a time to eliminate future troubles forever, therefore, the cost of long-term maintenance is reduced, and the operating safety is ensured.

Description

technical field

[0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a settlement control method for subway tunnels in operation. It is mainly applicable to technical fields such as long-term settlement control of subways operating in soft soil foundations along the coast and along the river due to factors such as train loads.

[0002] Background technique

[0003] With a large number of infrastructure such as subway tunnels in the country's coastal and weak soil areas along the river being put into operation, these projects are the lifeline projects of the country (or city), and their safety greatly affects the safety of people's lives and property, as well as social stability. The differential settlement of the tunnel during the operation period seriously affects the safety of train operation, and controlling the differential settlement of the tunnel during the operation period is one of the key technical issues to e...

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